Electric incandescent lamp with bipartite bulb.



P. WEISSE & S. BLU'QH. ummm INGANDBSGENT LAMP wrm BIPARTITB BULB. i APPLNATION FILED APE.1,1912.'

Patented Dec. 10,1912.

[five/fiar@- .-.einsame 2.5 and said bulb, 'said STATES' PA rEN-T OFFICE.

PAUL ol''obolfAp, HANOVER, AND sIGBERT BLOCH, oF CHARLOTTENBUCL. Y h GERMANY.

ELECTBIC AIll'GANDESGENT LAMP WITH BIPARTITE BULB.

Specification of Letters Patent.

Application led'April 1, 191,2. Serial No. 687,744.

To allqiwhom it co'riccm: Y

Be it known that we, PAUL-WEISSE and SIGBERT BLooH, subjects ofthe German Ein-.4. perf-ir, and residents, respectively, of Gronau,z

1'laiiovei3'Germany, and of Charlottenburg Germany, have invented certain new an useful Improvements in Electric Incandes- .cent Lamps with Bipartite Bulbs, of which f the following 1s a' specification.

aA The l'present Ainvention relates to incandescent la'mp's' and especially to lamps with metal filaments the glass bulb of which is inadebiparvtiteso 'as to allow of the lamps bein repaired after the filaments are 15 burned.

-Th'e novelty 'resides in that inan electric incandescent lamp with bipartite bulb, the

connecting ofsbot-h. bulb' portions is obtained.

'by n ieans -of'a soluble cement or jointing 20 compound. Said novelty further lies in that in an electric incandescentilainp, a cap, 'a glass bulb, open'at its upper end, Va carrier, the outer circular' bent edge of which extends between the ad'acent edges of said cap nt edge forming two oppositely directed adjacent grooves for receiving said adjacent edges* of the c ap and thegbulb and a soluble cement or jointing compound provided iiifsaid grooves for' firmly and tightly connecting together saidv adjacent edges ofthe cap, the bulb and the carrier. Y l

Glass bulbs made in two partis are known,

but the lamps-of that kind known imtil t-oday present a serious drawback. 'While the lair is exhausted, the bulbs sometimes burst. Furthermore it is very diilicult to tighten such an extent that the lamp keeps air tight.

4o The object of. the resent invention isto eliminate the above rawbacks so as to construct a lamp which, after .being repaired,

has the saine value asa new'onLwhile the repairing expenses are much, lower than the 4,5 purchasing cost of a new lamp.y

4'The accompanyinglf'drawing .shows at an enlarged scale a vertical axial sectionof a lamp according tothe invention.

.mounting Athe cap l by means of cement,-

the edge 6 enters the groove 5 of the carrier 2 sothat the empty space 7- between the cap i l and the carrier 2 reeeives the jointingcoiu- Patented me. 1o, 1912. l i

pound or cement. lhe'cement composition we preferably employ is cou'iposed of 'potsi 'si-um nitrate K, No. 3, 50 parts; sodium .nitrate, N, No. 3, 35 parts; nitrate of lead,

Pl. No. 3, 15 parts.

'In the outer groove -l ofthe carrier 2 is engagedtlie edge of the glass portion 3 of the bulb and said groove is filled with cement. Owing to this arrangement the edge 6 of the cap l is at a lower level than the edge of the bulb portion 3. The junction between the carrier 2 and the .bulb 3 is protested by the edge (3 ofitlie cap 1 and consequently the carrier is not exposed Yto'tlie pressure which is produced on 'the joint while exhausting. The jointing lmass between tlie bulb 3 and the edged of the eari'ier provides a firm and tight connection which satisfies every requirement. i

The cement or'jointing compound may be easily dissolvedpin water or vinegar, according -t o its composition. and the repairs may be executed very easily after removing the bulb 3.

Having now fully described our said in vention, what we claim and desire to secure by Letters Patent, is:

. '1. In a lamp of the class described, theconibination of a hollow outer cap member, an-1nner cap member formed at its edges with an inner seat open at its ftop and :in

; outer` seat which is open at` its bottom, the the joint betweenboth parts of the bulb to lower end of the outer cap member being seated in tlieinner seat and cemented therein..and a bulb having its upper free end fitted in the outer scat and cemented thereiu.

2. In a lamp of the character described.

the combination of an upper-outer cap' uve-mber, an inner cap member havingits lower edge supported on the lower edge of the. outer cap Ine-.i ber and provided with a eeutrlal'dependingr post to support the filau'ients,

and a bulb cemented tothe lower edge ofthe.

inner cap member, outsidethe vertical plane of the outer cap member.

In testimony vwhereof wehave hereunto set our hands in presence of two witnesses. PAUL'W'EISSE.

. SIGBERT BLOCH. Witnesses:

HENRY Humm; v- WLDEMAB HAUg'r. 

